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 High Impact's Klune-V / Atlas Transfer Case comboThe most flexible 4WD gearing system yet! |
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Developed for applications where the top-of-the line
available gearing system is needed. This is what I run in my Grand Cherokee
project vehicle. Atlas II Transfer caseThe Atlas II is the Top-of –the-heap, the culmination
of development in the “low geared transfer case” side of the fence. This
box is all gear drive, no chains. It has all helically cut gears, no
straight cut gears. It comes with a twin stick shifter. It is stout,
stronger than the factory T-cases used in Jeeps and sport utilities, and in
many larger pickups over the years. The case is aluminum, avoiding the
brutal weight of a big stout old time gear drive case, but is thick and
durable, unlike the paper thin aluminum used in most modern T-cases. And it
is fully synchronized, meaning you can shift it on the fly easily. Almost
all T-cases recommend that you stop or almost stop the vehicle before
shifting into or out of low range. The final feature is a big one: The case
was designed to fit almost any vehicle, with left or right drop versions
available, and with different input shafts available to match all popular
transmissions. Klune-V Extreme UnderdriveThis unit is the top of the heap in the “Dual
Transfer Case” group. Actually, it is not a transfer case at all. It is a
purpose and built gear reduction unit designed to bolt in between the
transmission and transfer case of a 4 wheel drive vehicle. It comes in two
versions: The “David” and the “Goliath”. The David uses a
double-compound planetary gear set to achieve a 4 to 1 reduction. The
Goliath is a 2.7 ratio planetary gear reduction. Both models have achieved
an excellent reputation for durability in their application niche. Since the
unit is used in front of the transfer case, it can be shifted in leaving the
T-case in high, or the T-case can be shifted into low leaving the Klune in
high, or they can both be shifted into low, with the Klune box multiplying
the gearing of the transfer case for “extreme underdrive” Klune-V plus Atlas: The Twain shall meetIn our Grand, we will need it all. (Or at least we want it, and have figured out how to get it. Doesn’t that amount to “Need”?) In our Grand, we elected to shoot for the ultimate by mating an Atlas to a Klune. In order to get the maximum gearing options possible, we selected an Atlas II 4.3 ratio transfer case, and coupled that to a Klune-V Goliath 2.7 ratio unit. When one unit has a much deeper reduction that the other, 4 different gear ranges can be achieved: Normal high range: Both boxes left in high range, axle ratio chosen for optimal highway driving. Shift the Klune into low, and the Atlas into high: Results in a “Normal” 2.7 ratio low range, best for forest trails, mud and sand. Shift the Atlas into low, leave the Klune in high: Now we are 4.3 to one and have the right gearing for good rock trails such as most of the Rubicon. Shift both into low, and you are in “Extreme Underdrive”. Almost 12 to one! This is far too slow for most trail riding, but is awesome for those super technical boulder groupings and “waterfalls”. By slowing it WAY down, we get the control to make it over some pretty tough stuff with a healthy degree of confidence we can make it through and back without breaking, and maybe even keeping the sheet metal off the rocks (tread lightly: don’t want any paint on those rocks!). And if we do have to winch, the tires will turn at winch speed allowing the winch and engine to work together smoothly. Gear Ratio Tables
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